https://bugzilla.redhat.com/show_bug.cgi?id=2500953
Bug ID: 2500953
Summary: CVE-2026-15747 perl-Mojolicious: Mojolicious:
Information disclosure via BREACH compression oracle
[fedora-all]
Product: Fedora
Version: rawhide
Status: NEW
Whiteboard: {"flaws": ["e36bc75e-1724-474d-9fb7-d241f546f9e3"]}
Component: perl-Mojolicious
Keywords: Security, SecurityTracking
Severity: medium
Priority: medium
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected],
[email protected],
[email protected], [email protected]
Blocks: 2500234
Target Milestone: ---
Classification: Fedora
Disclaimer: Community trackers are created by Red Hat Product Security team on
a best effort basis. Package maintainers are required to ascertain if the flaw
indeed affects their package, before starting the update process.
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable
representation of the session CSRF token to a BREACH compression oracle.
_csrf_token generates and caches one token per session and returns the same
value on every call, and _csrf_field places that value in a hidden `csrf_token`
input. When a response carrying the token also echoes attacker-controlled input
and is gzip-compressed, the chosen values and the resulting compressed lengths
form a BREACH oracle.
An attacker able to query it can recover the token and pass csrf_protect
validation.
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